RE: CF flash PATA on libata failure to attach

["Andrew Hall" <andrew.a.hall@gmail.com>]

> Here's a slightly modified hack, which should leave your SATA
> drive working as well as the CF card.
> 
> Tejun / Alan : do we really want to continue attempting mdma2
> on a modern chipset such as ICH8 ???
> 
> The best mdma2 can do is the same throughput as pio4,
> and the bus occupancy is so high for mdma2 that it really
> probably isn't worthwhile -- only CF cards seem to use it
> in modern systems anyway.
> 
> Signed-off-by:  Mark Lord <mlord@pobox.com>
> ---
> --- linux/drivers/ata/ata_piix.c.orig	2007-06-10 18:58:27.000000000
> -0400
> +++ linux/drivers/ata/ata_piix.c	2007-06-28 21:09:04.000000000 -0400
> @@ -537,7 +537,7 @@
>  		.flags		= PIIX_SATA_FLAGS | PIIX_FLAG_SCR |
>  				  PIIX_FLAG_AHCI,
>  		.pio_mask	= 0x1f,	/* pio0-4 */
> -		.mwdma_mask	= 0x07, /* mwdma0-2 */
> +		.mwdma_mask	= 0x00, /* mwdma0-2 */
>  		.udma_mask	= 0x7f,	/* udma0-6 */
>  		.port_ops	= &piix_sata_ops,
>  	},

That worked a treat! CF is flagged as PIO4 and HDD is now UDMA. I can't tell
you how grateful I am that you were able to point out the fix / modification
but I can certainly now sleep a bit easier.

Furthermore, if there is anything else I can do or would like me to test
while we have this type of hardware, please let me know.

Thanks again, Mark..